high level hopping code scramblers

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... voice privacy modules which can be installed into virtually every make and model of two-way radio manufactured by different manufacturers.
Starting with Inversion Scramblers* up to High Level Hopping Code Scramblers* and DES encryption* modules we have in our portfolio everything to find the appropriate solution to secure your communication.

Explanation:MSN took an early a.m. nap just as I was pulling up the relevant document for you, but here's a bit of what I did get, and the URL (the text is in Portuguese).
"scramblers" (misturadores de voz)
If you input hopping scramblers in Google, one of the first hits gives a pretty fair explanation in English of hopping, if interested. It looks like "misturadores" can stand alone since your context is about voice transmissions.

Answers

6 hrs confidence:

misturadores (de voz) de permutação em alta complexidade

Explanation:MSN took an early a.m. nap just as I was pulling up the relevant document for you, but here's a bit of what I did get, and the URL (the text is in Portuguese).
"scramblers" (misturadores de voz)
If you input hopping scramblers in Google, one of the first hits gives a pretty fair explanation in English of hopping, if interested. It looks like "misturadores" can stand alone since your context is about voice transmissions.